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https://www.readbyqxmd.com/read/28216337/identification-and-gene-expression-of-multiple-peptidoglycan-recognition-proteins-pgrps-in-the-deep-sea-mussel-bathymodiolus-azoricus-involvement-in-symbiosis
#1
Camille Détrée, François H Lallier, Arnaud Tanguy, Jean Mary
The relationship between the deep-sea mussel Bathymodiolus azoricus and its thiotrophic (SOX) and methanotrophic (MOX) symbionts has been ecologically and functionally well studied. Endosymbiosis is common in deep-sea hydrothermal vent fauna, yet little is known about the molecular mechanisms underlying the regulation of interactions between host and symbionts. In this study we focused on a group of pattern recognition receptors (PRR), called PGRPs that are able to recognize the peptidoglycan of bacterial cell wall...
February 12, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28215329/biotechnological-applications-of-marine-enzymes-from-algae-bacteria-fungi-and-sponges
#2
S Parte, V L Sirisha, J S D'Souza
Diversity is the hallmark of all life forms that inhabit the soil, air, water, and land. All these habitats pose their unique inherent challenges so as to breed the "fittest" creatures. Similarly, the biodiversity from the marine ecosystem has evolved unique properties due to challenging environment. These challenges include permafrost regions to hydrothermal vents, oceanic trenches to abyssal plains, fluctuating saline conditions, pH, temperature, light, atmospheric pressure, and the availability of nutrients...
2017: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/28209839/complete-genome-sequence-of-the-hyperthermophilic-piezophilic-archaeon-pyrococcus-kukulkanii-ncb100-isolated-from-the-rebecca-s-roost-hydrothermal-vent-in-the-guaymas-basin
#3
Philippe M Oger, Nolwenn Callac, Christine Oger-Desfeux, Sandrine Hughes, Benjamin Gillet, Mohamed Jebbar, Anne Godfroy
Members of the order Thermococcales are common inhabitants of high-temperature hydrothermal vent systems (black smokers) that are represented in clone libraries mostly by isolates from the Thermococcus genus. We report the complete sequence of a novel species from the Pyrococcus genus, P. kukulkanii strain NCB100, which has been isolated from a flange fragment of the Rebecca's Roost hydrothermal vent system in the Guaymas Basin.
February 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28206708/physiological-metabolic-and-biotechnological-features-of-extremely-thermophilic-microorganisms
#4
REVIEW
James A Counts, Benjamin M Zeldes, Laura L Lee, Christopher T Straub, Michael W W Adams, Robert M Kelly
The current upper thermal limit for life as we know it is approximately 120°C. Microorganisms that grow optimally at temperatures of 75°C and above are usually referred to as 'extreme thermophiles' and include both bacteria and archaea. For over a century, there has been great scientific curiosity in the basic tenets that support life in thermal biotopes on earth and potentially on other solar bodies. Extreme thermophiles can be aerobes, anaerobes, autotrophs, heterotrophs, or chemolithotrophs, and are found in diverse environments including shallow marine fissures, deep sea hydrothermal vents, terrestrial hot springs-basically, anywhere there is hot water...
February 16, 2017: Wiley Interdisciplinary Reviews. Systems Biology and Medicine
https://www.readbyqxmd.com/read/28205388/hydrogen-or-formate-alternative-key-players-in-methanogenic-degradation
#5
REVIEW
Bernhard Schink, Dominik Montag, Anja Keller, Nicolai Müller
Hydrogen and formate are important electron carriers in methanogenic degradation in anoxic environments such as sediments, sewage sludge digestors, and biogas reactors. Especially in the terminal steps of methanogenesis, they determine the energy budgets of secondary (syntrophically) fermenting bacteria and their methanogenic partners. The literature provides considerable data on hydrogen pool sizes in such habitats, but little data exist for formate concentrations due to technical difficulties in formate determination at low concentration...
February 15, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28194142/respiratory-ammonification-of-nitrate-coupled-to-anaerobic-oxidation-of-elemental-sulfur-in-deep-sea-autotrophic-thermophilic-bacteria
#6
Galina B Slobodkina, Andrey V Mardanov, Nikolai V Ravin, Anastasia A Frolova, Nikolay A Chernyh, Elizaveta A Bonch-Osmolovskaya, Alexander I Slobodkin
Respiratory ammonification of nitrate is the microbial process that determines the retention of nitrogen in an ecosystem. To date, sulfur-dependent dissimilatory nitrate reduction to ammonium has been demonstrated only with sulfide as an electron donor. We detected a novel pathway that couples the sulfur and nitrogen cycles. Thermophilic anaerobic bacteria Thermosulfurimonas dismutans and Dissulfuribacter thermophilus, isolated from deep-sea hydrothermal vents, grew autotrophically with elemental sulfur as an electron donor and nitrate as an electron acceptor producing sulfate and ammonium...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28187634/a-new-species-of-the-genus-i-alvinocaris-i-williams-and-chace-1982-crustacea-decapoda-caridea-alvinocarididae-from-the-manus-basin-hydrothermal-vents-southwest-pacific
#7
Yan-Rong Wang, Zhong-Li Sha
One new species of alvinocaridid Alvinocaris kexueae sp. nov. is described from hydrothermal vents on the Manus Basin, Southwest Pacific. This is the fifteenth species in Alvinocaris Williams & Chace, 1982. The new species is easily recognized by the combination of the rostrum distinctively overreaching the distal end of the antennular peduncle, and the armature of its dorsal and ventral margins; the unarmed third abdominal segment, and by the posterior margin of the telson having one triangular tooth medially and 6 pairs unequal spines...
January 25, 2017: Zootaxa
https://www.readbyqxmd.com/read/28150576/desulfurobacterium-indicum-sp-nov-a-thermophilic-sulfur-reducing-bacterium-from-the-indian-ocean
#8
Junwei Cao, Tiphaine Birien, Nicolas Gayet, Zhaobin Huang, Zongze Shao, Mohamed Jebbar, Karine Alain
A novel sulfur-reducing bacterium, strain K6013T, was isolated from a sulfide sample collected at a depth of 2,771 m from a high-temperature hydrothermal vent in the Indian Ocean. Cells were Gram-negative, anaerobic, motile rods (0.9-2.2 × 0.4-0.6 μm). The strain grew at NaCl concentrations ranging from 1 to 4.5% (w/v) (optimum 2.5%), from pH 5 to 8 (optimum 6), and at temperatures between 40 and 75 °C (optimum 65 °C). Strain K6013T was an obligate chemolithoautotroph using thiosulfate, sulfur, and nitrate as terminal electron acceptors in the presence of H2, but not sulfate, sulfite nor nitrite...
February 1, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28144700/sediment-microbial-diversity-of-three-deep-sea-hydrothermal-vents-southwest-of-the-azores
#9
Teresa Cerqueira, Diogo Pinho, Hugo Froufe, Ricardo S Santos, Raul Bettencourt, Conceição Egas
Menez Gwen, Lucky Strike and Rainbow are the three most visited and well-known deep-sea hydrothermal vent fields in the Azores region, located in the Mid-Atlantic Ridge. Their distinct geological and ecological features allow them to support a diversity of vent communities, which are largely dependent on Bacteria and Archaea capable of anaerobic or microaerophilic metabolism. These communities play important ecological roles through chemoautotrophy, feeding and in establishing symbiotic associations. However, the occurrence and distribution of these microbes remain poorly understood, especially in deep-sea sediments...
January 31, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28119504/synchronized-chaotic-targeting-and-acceleration-of-surface-chemistry-in-prebiotic-hydrothermal-microenvironments
#10
Aashish Priye, Yuncheng Yu, Yassin A Hassan, Victor M Ugaz
Porous mineral formations near subsea alkaline hydrothermal vents embed microenvironments that make them potential hot spots for prebiotic biochemistry. But, synthesis of long-chain macromolecules needed to support higher-order functions in living systems (e.g., polypeptides, proteins, and nucleic acids) cannot occur without enrichment of chemical precursors before initiating polymerization, and identifying a suitable mechanism has become a key unanswered question in the origin of life. Here, we apply simulations and in situ experiments to show how 3D chaotic thermal convection-flows that naturally permeate hydrothermal pore networks-supplies a robust mechanism for focused accumulation at discrete targeted surface sites...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28117546/steep-ph-gradients-and-directed-colloid-transport-in-a-microfluidic-alkaline-hydrothermal-pore
#11
Friederike M Möller, Franziska Kriegel, Michael Kieß, Victor Sojo, Dieter Braun
All life on earth depends on the generation and exploitation of ionic and pH gradients across membranes. One theory for the origin of life proposes that geological pH gradients were the prebiotic ancestors of these cellular disequilibria. With an alkaline interior and acidic exterior, alkaline vents match the topology of modern cells, but it remains unknown whether the steep pH gradients persist at the microscopic scale. Herein, we demonstrate the existence of 6 pH-unit gradients across micrometer scales in a microfluidic vent replicate...
January 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28115547/proteomic-and-mutant-analysis-of-the-co2-concentrating-mechanism-of-hydrothermal-vent-chemolithoautotroph-thiomicrospira-crunogena
#12
Mary Mangiapia, Terry-René W Brown, Dale Chaput, Edward Haller, Tara L Harmer, Zahra Hashemy, Ryan Keeley, Juliana Leonard, Paola Mancera, David Nicholson, Stanley Stevens, Pauline Wanjugi, Tania Zabinski, Chongle Pan, Kathleen M Scott
: Many autotrophic microorganisms are likely to adapt to scarcity in dissolved inorganic carbon (DIC; = CO2 + HCO3(-) + CO3(2-)) with CO2 concentrating mechanisms (CCM) which actively transport DIC across the cell membrane to facilitate carbon fixation. Surprisingly, DIC transport has only been well-studied among cyanobacteria and microalgae. Deep-sea vent gammaproteobacterial chemolithoautotroph Thiomicrospira crunogena has a low-DIC inducible CCM, though the mechanism for uptake is unclear, as homologs to cyanobacterial transporters are absent...
January 23, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28106741/the-role-of-lipid-membranes-in-life-s-origin
#13
REVIEW
David Deamer
At some point in early evolution, life became cellular. Assuming that this step was required for the origin of life, there would necessarily be a pre-existing source of amphihilic compounds capable of assembling into membranous compartments. It is possible to make informed guesses about the properties of such compounds and the conditions most conducive to their self-assembly into boundary structures. The membranes were likely to incorporate mixtures of hydrocarbon derivatives between 10 and 20 carbons in length with carboxylate or hydroxyl head groups...
January 17, 2017: Life
https://www.readbyqxmd.com/read/28088716/unveiling-the-transformation-and-bioavailability-of-dissolved-organic-matter-in-contrasting-hydrothermal-vents-using-fluorescence-eem-parafac
#14
Liyang Yang, Wan-E Zhuang, Chen-Tung Arthur Chen, Bing-Jye Wang, Fu-Wen Kuo
The submarine hydrothermal systems are extreme environments where active cycling of dissolved organic matter (DOM) may occur. However, little is known about the optical properties and bioavailability of hydrothermal DOM, which could provide valuable insights into its transformation processes and biogeochemical reactivity. The quantity, quality, and bioavailability of DOM were investigated for four very different hydrothermal vents east of Taiwan, using dissolved organic carbon (DOC), absorption spectroscopy, and fluorescence excitation-emission matrices-parallel factor analysis (EEM-PARAFAC)...
January 3, 2017: Water Research
https://www.readbyqxmd.com/read/28087525/capturing-compositional-variation-in-denitrifying-communities-a-multiple-primer-approach-that-includes-autotrophic-denitrifying-epsilonproteobacteria
#15
Sheryl A Murdock, S Kim Juniper
: Denitrifying Epsilonproteobacteria may dominate nitrogen loss processes in marine habitats with intense redox gradients but assessment of their importance is limited by currently available primers for nitrite reductase genes. Nine new primers targeting the nirS gene of denitrifying Epsilonproteobacteria were designed and tested for use in sequencing and quantitative PCR on two microbial mat samples (Vent 2 and Vent 4) from the Calypso hydrothermal vent field, Bay of Plenty, New Zealand...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28086786/widespread-introgression-in-deep-sea-hydrothermal-vent-mussels
#16
Corinna Breusing, Robert C Vrijenhoek, Thorsten B H Reusch
BACKGROUND: The analysis of hybrid zones is crucial for gaining a mechanistic understanding of the process of speciation and the maintenance of species boundaries. Hybrid zones have been studied intensively in terrestrial and shallow-water ecosystems, but very little is known about their occurrence in deep-sea environments. Here we used diagnostic, single nucleotide polymorphisms in combination with one mitochondrial gene to re-examine prior hypotheses about a contact zone involving deep-sea hydrothermal vent mussels, Bathymodiolus azoricus and B...
January 13, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28078050/complete-genome-sequence-of-lutibacter-profundi-lp1-t-isolated-from-an-arctic-deep-sea-hydrothermal-vent-system
#17
Juliane Wissuwa, Sven Le Moine Bauer, Ida Helene Steen, Runar Stokke
Lutibacter profundi LP1(T) within the family Flavobacteriaceae was isolated from a biofilm growing on the surface of a black smoker chimney at the Loki's Castle vent field, located on the Arctic Mid-Ocean Ridge. The complete genome of L. profundi LP1(T) is the first genome to be published within the genus Lutibacter. L. profundi LP1(T) consists of a single 2,966,978 bp circular chromosome with a GC content of 29.8%. The genome comprises 2,537 protein-coding genes, 40 tRNA species and 2 rRNA operons. The microaerophilic, organotrophic isolate contains genes for all central carbohydrate metabolic pathways...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28074949/new-compounds-from-a-hydrothermal-vent-crab-associated-fungus-aspergillus-versicolor-xz-4
#18
Chengqian Pan, Yutong Shi, Xuegang Chen, Chen-Tung Arthur Chen, Xinyi Tao, Bin Wu
Three new quinazoline derivatives (1-3), one new oxepin-containing natural product (4) and four new cyclopenin derivatives (5-7 and 9) have been isolated from an EtOAc extract of the Taiwan Kueishantao hydrothermal vent crab-associated fungus Aspergillus versicolor XZ-4. Their planar structures were established by HRMS, 1D and 2D NMR spectroscopic data analyses. The absolute configurations for compounds 1 and 4 were determined by chiral phase HPLC analysis of their hydrolysis products. The absolute configurations of 2, 3 and 7 were defined mainly by comparison of the quantum chemical TDDFT calculated and the experimental ECD spectra, and the absolute configuration of 5 was deduced from comparison of the optical rotation values reported in the literature...
February 1, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28054448/taxonomic-research-on-deep-sea-macrofauna-in-the-south-china-sea-using-the-chinese-deep-sea-submersible-jiaolong
#19
REVIEW
Xinzheng Li
This paper reviews the taxonomic and biodiversity studies of the deep-sea invertebrates in the South China Sea based on the samples collected by the Chinese manned deep-sea submersible Jiaolong. To date, six new species were described, including the sponges Lophophysema eversa Gong, Li & Qiu, 2014, Saccocalyx microhexactin Gong, Li & Qiu, 2015, and Semperella jiaolongae Gong, Li & Qiu, 2015 as well as the crustaceans Uroptychus jiaolongae Dong & Li, 2015, Uroptychus spinulosus Dong & Li, 2015 and Globospongicola jiaolongi Jiang, Kou & Li, 2015, and some newly recorded species from the South China Sea were reported...
January 5, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/28045457/endemicity-of-the-cosmopolitan-mesophilic-chemolithoautotroph-sulfurimonas-at-deep-sea-hydrothermal-vents
#20
Sayaka Mino, Satoshi Nakagawa, Hiroko Makita, Tomohiro Toki, Junichi Miyazaki, Stefan M Sievert, Martin F Polz, Fumio Inagaki, Anne Godfroy, Shingo Kato, Hiromi Watanabe, Takuro Nunoura, Koichi Nakamura, Hiroyuki Imachi, Tomo-O Watsuji, Shigeaki Kojima, Ken Takai, Tomoo Sawabe
Rich animal and microbial communities have been found at deep-sea hydrothermal vents. Although the biogeography of vent macrofauna is well understood, the corresponding knowledge about vent microbial biogeography is lacking. Here, we apply the multilocus sequence analysis (MLSA) to assess the genetic variation of 109 Sulfurimonas strains with ⩾98% 16S rRNA gene sequence similarity, which were isolated from four different geographical regions (Okinawa Trough (OT), Mariana Volcanic Arc and Trough (MVAT), Central Indian Ridge (CIR) and Mid-Atlantic Ridge (MAR))...
January 3, 2017: ISME Journal
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